Article

A hidden market in plain sight

The Market for Airline Miles

You think you are earning travel. The airline thinks it is selling you to a bank.

By the end, you will see why an airline makes more money creating miles than it makes flying planes.

The reward did not come from flying.

You swipe your card for groceries.

A few hundred miles land in your account that night.

It feels like a gift. A small reward for being loyal. A few more steps toward a free flight.

You file it away as travel you are slowly earning.

You are not earning travel.

You just helped an airline close a sale that had nothing to do with you flying anywhere.

Bottom line — The miles you earn buying groceries are the product. The flight is the marketing.

The hidden equation

Airlines are no longer mainly in the business of moving people. They are in the business of creating a currency and selling it to banks.

The flying part loses money.

This sounds like exaggeration. It is not.

In 2024 the four largest U.S. airlines reported a combined operating profit of roughly fourteen billion dollars. That looks like a healthy aviation business.

It was not an aviation business. Analysis of those results shows all four lost money on the core work of flying passengers.

Strip out the credit card money and Delta would have run at a negative margin. So would United. The profit did not come from the cabin. It came from the card.

Bottom line — The planes are a cost center. The loyalty program is the profit center.

7.4billion dollars

In 2024, Delta received 7.4 billion dollars from its American Express partnership alone. That single number equaled Delta's entire operating profit for the year.

interrupt
loss frame

Bottom line — One bank deal paid for the whole airline's profit. The flights, on their own, did not.

A mile is not a reward. It is something the airline manufactures and sells.

01
The airline creates the mile
A mile costs the airline almost nothing to invent. It is a database entry, a promise of future travel.
02
The bank buys the mile in bulk
Before you ever earn it, your bank purchases miles from the airline at a negotiated price.
03
The bank hands you the mile
You spend on the card. The bank credits you miles it already paid for. The airline has its cash.
04
The bank profits from your behavior
The bank earns interchange on every purchase, plus interest if you carry a balance. You are its asset.

Bottom line — The airline sells miles to the bank. The bank sells the card to you. You are the last link, not the customer being served.

The float

When a bank buys your miles upfront, the airline captures the money whether you ever fly or not. Your redemption is optional. Their revenue is already booked.

The currency is the high-margin product.

This is why the margins are unlike anything in aviation.

Flying a passenger is brutal. Fuel, crews, gates, maintenance, weather, fares set by competitors. Ticket margins run in the low single digits to the mid teens.

Selling miles is not like that.

In 2019 American Airlines generated mileage sales at a fifty-three percent profit margin. Selling the currency was several times more profitable than selling the seats.

Bottom line — A seat earns single digits. A mile earns more than half its price in profit.

Where the money actually comes from,

The bank money now rivals the airline's entire profit

You see an airline and assume tickets pay the bills. The biggest numbers on the page come from credit cards, not cabins.

How to read thisEach bar is one real figure from 2024, shown in billions of dollars.

U.S. airline credit card and loyalty revenue against total industry operating profit, 2024, in billions of dollars.

NoticeDelta's American Express deal alone brought in 7.4 billion dollars, equal to its whole operating profit. American's card partners paid 6.1 billion. The four largest carriers' combined operating profit was only 14

For you

The next time an airline cuts a route or shrinks legroom, remember the part of the business that actually pays is the part that issues miles.

Behind the numbers

Sources: Delta received 7.4 billion dollars from its American Express partnership in 2024, equal to its entire operating profit (Medium, The Loyalty Paradox). American Airlines received 6.1 billion dollars in cash remuneration from co-branded credit cards in 2024, up 17 percent year over year (American Airlines Fourth-Quarter 2024 Financial Results). The four largest U.S. airlines reported a combined operating profit of 14 billion dollars in 2024, with analysis showing core passenger operations were unprofitable (Cranky Flier, Airline Credit Card Financial Model).

Verify the data ↗

Bottom line — The danger is not that miles exist. It is that the profitable airline and the airline that flies you are two different companies wearing the same name.

So the loyalty program does not help the airline. The loyalty program is the airline. The metal tubes in the sky are the part that loses money so the program can keep selling currency.

A mile looks like one simple thing. It is three different things at once.

What you hold as a reward is, on three other balance sheets, three different financial objects.

01To you, a mile is savings
A small deposit toward a future trip. Something you are slowly building. Travel wealth in progress.
02To the airline, a mile is debt
It sits on the balance sheet as deferred revenue, a liability, an unredeemed promise the airline owes you in travel.
03To the bank, a mile is inventory
A unit it purchased to attract and keep cardholders, whose real value is your spending data and interchange fees.
04Underneath all three, a mile is collateral
The future cash flow from selling miles can be pledged to lenders and borrowed against, as if the program were a bank of its own.

The same mile is your savings, the airline's debt, the bank's inventory, and a lender's collateral. Only one of those parties sets its value.

THE INVERSION

You treat your miles as an asset. To the airline, the exact same miles are a liability it is trying to make smaller without telling you.

You hold the debt. They set the rate.

Here is the part that should change how you see your account.

Your miles are a debt the airline owes you. And the airline gets to set the exchange rate.

No one else can do this. Your bank cannot quietly decide your dollars now buy thirty percent less. The airline can. It is called dynamic pricing, and it runs in one direction.

Between roughly 2015 and 2023, Delta raised the price of a business class award between the United States and Europe from about 62,500 miles to over 120,000 miles. A ninety percent increase. No reset. No announcement. Just a slow, quiet repricing of money you already held.

Bottom line — A debtor that can shrink what it owes you whenever it likes is not really in debt to you.

15percent per year

Airline miles depreciate at roughly 15 percent a year, about six times faster than U.S. inflation of two to three percent.

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loss frame

Bottom line — Holding miles is not saving. It is holding a currency engineered to lose value faster than cash in a drawer.

what the program was vs. what it became

What it was built to do

Reward people who flew the airline often.
Earn status by being in the air, in real seats, on real routes.
Tie loyalty to travel, so loyal flyers kept choosing the same carrier.

What it actually does now

Reward people who spend on a co-branded credit card.
Earn status by hitting a spending number, sometimes without flying at all.
Tie loyalty to a bank, so the airline keeps selling miles.

Bottom line — The frequent flyer program stopped being about flying. It became a spending club with a frequent flyer logo on the front.

Status now measures your spending, not your miles flown.

The inversion is now measurable.

Delta, United, and American restructured elite status so that credit card spending counts as much as flying, sometimes more. By 2024, around seventy-two percent of elite status members earned their status through spending rather than travel.

Think about what that means. Elite status was supposed to signal a loyal flyer. Now it mostly signals a heavy cardholder. The badge no longer tells the airline who flies. It tells the bank who spends.

Bottom line — When most elites earn status without flying, the program's real customer is the card issuer, not the traveler.

Why the program is worth more than the airline that owns it

01
Above the surface: the airline
Planes, gates, crews, fares set by rivals, fuel that swings, margins that vanish in a downturn.
02
Below the surface: the program
A stream of high-margin mile sales to banks, growing every year, far steadier than ticket revenue.
03
Deeper still: the valuation
The three largest U.S. programs were valued at 83.8 billion dollars combined, Delta SkyMiles alone at 31.783 billion.
04
At the bottom: the truth
Those program valuations have at times exceeded the airlines' own equity, making the program the more valuable asset.

Bottom line — When the loyalty program is worth more than the airline, the right way to read it is simple: the program owns the airline, not the other way around.

Loyalty program valuations, 2026

The loyalty programs are worth more than most of the airlines

You picture an airline's value as planes and routes. The most valuable thing it owns is the mile factory.

How to read thisEach bar is a loyalty program's 2026 valuation, in billions of dollars.

Estimated valuations of the three largest U.S. airline loyalty programs, 2026, in billions of dollars.

NoticeDelta SkyMiles was ranked the world's most valuable loyalty program at 31.783 billion dollars, with most of its value coming from credit card partnerships. American AAdvantage was valued at 26.7 billion and United

For you

When you join a frequent flyer program, you are not joining a perk. You are joining the single most valuable business the airline runs.

Behind the numbers

Source: 2026 On Point Loyalty rankings, reported via Roaming Cactus, Delta SkyMiles 2026 Valuation. Delta SkyMiles valued at 31.783 billion dollars (world's most valuable loyalty program, 68 percent of value from credit card partnerships), American AAdvantage at 26.7 billion, United MileagePlus at 25.3 billion. The three largest U.S. programs are worth 83.8 billion dollars combined.

Verify the data ↗

Bottom line — The airline is the body. The program is the brain that decides what the body is for.

When they needed to survive, they pledged the miles, not the planes.

And these programs do not just sit on the balance sheet. They get borrowed against.

When travel collapsed in the pandemic, the airlines did not mortgage their planes. They mortgaged their miles.

Between June 2020 and March 2021, Delta, United, and American securitized over twenty-six billion dollars in debt backed by loyalty program revenue. United alone raised 6.8 billion dollars against MileagePlus, a program it valued at twenty billion, more than the airline itself was worth at the time.

Lenders were comfortable doing this. They trusted the mile machine to keep producing cash even if the airline stopped flying.

Bottom line — Lenders treated the loyalty program as the safest asset the airline had. Safer than the airline.

The layered claim

Your miles are simultaneously a debt the airline owes you and an asset it has already sold to a bank and borrowed against. You are holding the bottom of a stack of claims, and your claim is the one that quietly shrinks.

It adds up to a parallel economy you do not control.

Zoom out and the scale becomes hard to ignore.

Roughly three hundred billion dollars in points and miles are issued every year. Some estimates rank loyalty points behind only the dollar and the euro as a global currency. McKinsey has estimated thirty trillion airline miles sit unredeemed worldwide, enough for every U.S. adult to fly to Europe in business class.

This is a shadow currency. And unlike a real one, you cannot hedge it, cannot move it freely, and cannot stop its issuer from devaluing it at will.

Bottom line — A currency you cannot protect against inflation, issued by a party that profits when it devalues, is not wealth. It is leverage held over you.

But what about…

But I always come out ahead

“I redeem my miles, so the system works for me.”
Some travelers do extract real value, and the savvy ones extract a lot. But the system is designed around the average. Most miles depreciate, expire, or get redeemed at low value. The airline prices the program assuming you will not be the exception.
“The card is free money. I pay no fee and earn rewards.”
You pay through interchange, the 2 to 3 percent the merchant is charged on your purchase, which gets baked into prices everyone pays. The rewards are funded by a fee you do not see on your statement.
“Miles never expire on my airline, so I am not losing anything.”
Several carriers dropped expiration on purpose, because it keeps you in the program. American keeps a 24-month expiration unless you hold its card, using the threat of expiry to keep you spending. Either way, the goal is the same: keep you holding a depreciating asset.
“It is just a loyalty perk. Why read so much into it?”
Because the numbers say otherwise. When one bank deal equals an airline's entire profit, and the program is worth more than the airline, it is not a perk on the side. It is the main business, and you are inside it.

Bottom line — The program can reward a few sharp users and still be built to profit from everyone else.

A clearer lens

How to read your miles like the airline does

Not advice to quit. A way to see the same account the way the people who designed it see it.

01
Treat miles as a depreciating currency, not savings
If they lose roughly 15 percent a year, holding a giant balance is holding a melting asset. Earn near when you plan to spend.
02
Know that you are the bank's product, not the airline's
Your spending data and interchange are the real revenue. The flight is the lure that gets you to keep swiping.
03
Watch the exchange rate, because only they can move it
The same award can cost far more next year with no announcement. There is no fixed value to plan around.
04
Notice when status comes from spending, not flying
If you earn elite tiers by hitting a dollar number, you are in a spending club, and the badge tells the bank who you are.

Bottom line — You do not have to leave the game. You just have to stop confusing the score with wealth.

Prediction · claim

Regulators have already noticed. In 2024 the U.S. Department of Transportation opened an investigation into the four largest carriers over devaluation, dynamic pricing, and shrinking award availability. The fight over who controls the value of a mile will only intensify, because

Metric: loyalty program scrutiny(regulatory actions)
Confidence: 70%
Resolves: Dec 31, 2028

Bottom line — When a perk becomes a multi-billion-dollar financial product, it stops being a marketing question and becomes a consumer-protection one.

Look at your balance one more time.

So look at the account again.

The balance is not a stack of future trips you have been quietly saving.

It is the receipt of a deal between an airline and a bank, in which your spending was the thing being bought and sold.

The airline got cash upfront. The bank got your behavior. You got a number that loses value every year, on terms you cannot change.

Once you see that, the whole industry reads differently.

Bottom line — The point is not to feel cheated. It is to stop mistaking a financial instrument for a gift.

When you earn miles, are you the customer the airline is serving, or the product it is selling to a bank?

The answer changes how you read every reward, every status tier, and every quiet devaluation.

I am the product, and my spending is what is being sold.
The bank is the airline's real customer.
The miles are a financial instrument, not savings.

Bottom line — The scariest part of the loyalty program is not that it tricks you. It is that it works exactly as designed while you thank it.

Closing line

Airlines did not add a finance business to flying. They built a finance business and kept flying as the infrastructure that makes the miles worth buying.

Sources

Evidence trail for the claims about airline credit card revenue, loyalty program valuations, mile devaluation, securitization, and the regulatory response.